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Finding the Fourth Proportional to 12,667.60, 18,979.80 and 10,464.40

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Solution

The fourth proportional to 12,667.60, 18,979.80 and 10,464.40 is: 15,678.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,667.60 : 18,979.80 = 10,464.40 : x
  2. Step 2: Convert to fraction form
    12,667.60/18,979.80 = 10,464.40/x
  3. Step 3: Cross multiply
    12,667.60x = 18,979.80 × 10,464.40
  4. Step 4: Simplify right side
    12,667.60x = 198,612,219.12
  5. Step 5: Solve for x
    x = 198,612,219.12/12,667.60
  6. Step 6: Final answer
    x = 15,678.76

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.